He was awarded the prestigious Military Medal and Bar in 1917 after he bravely returned to enemy territory to save his wounded captain, and during a strategic withdrawal volunteered to stay behind, risking his own life, to disable the guns so they would not fall into enemy hands.

Later in 1939, Sgt Morgan passed on his experiences to the Treharris Home Guard and trained others in the use of explosives.

He was buried in Treharris with full military honours in 1972, aged 82.

Granddaughter Wendy said: “I feel very proud, we all feel proud to remember our grandfather and his contribution to the war.

“And it is also just as important to remember his colleagues who didn’t come back from the war. I know he would have wanted to remember them, too.

“As children, we would come here to see him carrying the standard on Remembrance Day. We would see him wearing his medals and polishing his shoes.

“He never spoke about the war, he was a quiet man. To us, he was just our grandfather but little did we know what he went through, what he saw, the suffering and the gallantry.”

Other artefacts on display belong to Alan, who himself served with the Junior Bandsmen of the South Wales Borderers from 1960 and was posted in Hong Kong from 1964-66.

Alan, who served 26 years in the regulars and 11 years in the TA, donated medals and uniforms to the exhibition.

“I think it’s brilliant to have a display like this. Those in the war should never be forgotten,” he said.

“It’s important for youngsters to learn about the war. It teaches you discipline and to respect your elders. Everyone should learn from the lessons of war.”

The display also features a collection of poems from the library’s creative writing group The Write Time. Allison Hunt, who holds the class every two weeks on a Tuesday, said the group explored the impact of war not only on the men but also woman and families.

Reflecting on the exhibition, librarian Jayne Edwards added: “It’s turned out brilliantly. We’ve had a lot people visit the library who have never been here before but they’ve been looking and commenting on the display which is fantastic.”